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The image (red in the mockup) needs to be created on the server using a command like this:
convert -background lightblue -fill blue -font AvantGarde-Book -pointsize 72 label:Anthony result.png
That will create "result.png" on the server and return the URL to the client which will replace the image without reloading the page. You cannot use a frame or iframe, you have to use XMLHttpRequest.
It doesn't matter what size the image is or what colours you use as long as the result is clearly visible.